The XFontsOfFontSet function returns a list of one or more
XFontStructs and font names for the fonts used by the Xmb and Xwc layers
for the given font set. A list of pointers to the XFontStruct structures
is returned to font_struct_list_return. A list of pointers to null-terminated,
fully specified font name strings in the locale of the font set is returned
to font_name_list_return. The font_name_list order corresponds to the font_struct_list
order. The number of XFontStruct structures and font names is returned
as the value of the function.

Because it is not guaranteed that a given
character will be imaged using a single font glyph, there is no provision
for mapping a character or default string to the font properties, font
ID, or direction hint for the font for the character. The client may access
the XFontStruct list to obtain these values for all the fonts currently
in use.

Xlib does not guarantee that fonts are loaded from the server at
the creation of an XFontSet. Xlib may choose to cache font data, loading
it only as needed to draw text or compute text dimensions. Therefore, existence
of the per_char metrics in the XFontStruct structures in the XFontStructSet
is undefined. Also, note that all properties in the XFontStruct structures
are in the STRING encoding.

The XFontStruct and font name lists are owned
by Xlib and should not be modified or freed by the client. They will be
freed by a call to XFreeFontSet with the associated XFontSet. Until
freed, their contents will not be modified by Xlib.

The XBaseFontNameListOfFontSet
function returns the original base font name list supplied by the client
when the XFontSet was created. A null-terminated string containing a list
of comma-separated font names is returned as the value of the function. White
space may appear immediately on either side of separating commas.

If XCreateFontSet
obtained an XLFD name from the font properties for the font specified
by a non-XLFD base name, the XBaseFontNameListOfFontSet function will
return the XLFD name instead of the non-XLFD base name.

The base font name
list is owned by Xlib and should not be modified or freed by the client.
It will be freed by a call to XFreeFontSet with the associated XFontSet.
Until freed, its contents will not be modified by Xlib.

The XLocaleOfFontSet
function returns the name of the locale bound to the specified XFontSet,
as a null-terminated string.

The returned locale name string is owned by
Xlib and should not be modified or freed by the client. It may be freed
by a call to XFreeFontSet with the associated XFontSet. Until freed,
it will not be modified by Xlib.

The XContextDependentDrawing function
returns True if the drawing functions implement implicit text directionality
or if text drawn with the font_set might include context-dependent drawing;
otherwise, it returns False.

The XContextualDrawing function returns
True if text drawn with the font set might include context-dependent drawing;
otherwise, it returns False.